Actin and myosin

Page
1

Slide 1

Slide 2

actin

Slide 3

actin

troponin

Slide 4

actin

troponin

tropomyosin

Slide 5

actin

troponin

tropomyosin

Slide 6

actin

troponin

tropomyosin

myosin binding site

Slide 7

Slide 8

Ca2+

Ca2+

Ca2+

Ca2+

Slide 9

Ca2+

Ca2+

Ca2+

Ca2+

Calcium ions are released from the sarcolemma after stimulation from the T system

Slide 10

Ca2+

Ca2+

Ca2+

Ca2+

Slide 11

Ca2+

Ca2+

Ca2+

Ca2+

the calcium ions bind to the troponin and changes its shape

Slide 12

Ca2+

Ca2+

Ca2+

Ca2+

the calcium ions bind to the troponin and changes its shape

Slide 13

Ca2+

Ca2+

Ca2+

Ca2+

Slide 14

Ca2+

Ca2+

Ca2+

Ca2+

Slide 15

Ca2+

Ca2+

Ca2+

Ca2+

the troponin displaces the tropomyosin and exposes the myosin binding sites

Slide 16

Ca2+

Ca2+

Ca2+

Ca2+

Slide 17

Ca2+

Ca2+

Ca2+

Ca2+

Slide 18

Ca2+

Ca2+

Ca2+

Ca2+

the bulbous heads of the myosin attach to the binding sites on the actin filaments

Slide 19

Ca2+

Ca2+

Ca2+

Ca2+

Slide 20